Edit: __future__.py
"""Record of phased-in incompatible language changes. Each line is of the form: FeatureName = "_Feature(" OptionalRelease "," MandatoryRelease "," CompilerFlag ")" where, normally, OptionalRelease < MandatoryRelease, and both are 5-tuples of the same form as sys.version_info: (PY_MAJOR_VERSION, # the 2 in 2.1.0a3; an int PY_MINOR_VERSION, # the 1; an int PY_MICRO_VERSION, # the 0; an int PY_RELEASE_LEVEL, # "alpha", "beta", "candidate" or "final"; string PY_RELEASE_SERIAL # the 3; an int ) OptionalRelease records the first release in which from __future__ import FeatureName was accepted. In the case of MandatoryReleases that have not yet occurred, MandatoryRelease predicts the release in which the feature will become part of the language. Else MandatoryRelease records when the feature became part of the language; in releases at or after that, modules no longer need from __future__ import FeatureName to use the feature in question, but may continue to use such imports. MandatoryRelease may also be None, meaning that a planned feature got dropped. Instances of class _Feature have two corresponding methods, .getOptionalRelease() and .getMandatoryRelease(). CompilerFlag is the (bitfield) flag that should be passed in the fourth argument to the builtin function compile() to enable the feature in dynamically compiled code. This flag is stored in the .compiler_flag attribute on _Future instances. These values must match the appropriate #defines of CO_xxx flags in Include/compile.h. No feature line is ever to be deleted from this file. """ all_feature_names = [ "nested_scopes", "generators", "division", "absolute_import", "with_statement", "print_function", "unicode_literals", "barry_as_FLUFL", "generator_stop", "annotations", ] __all__ = ["all_feature_names"] + all_feature_names # The CO_xxx symbols are defined here under the same names defined in # code.h and used by compile.h, so that an editor search will find them here. # However, they're not exported in __all__, because they don't really belong to # this module. CO_NESTED = 0x0010 # nested_scopes CO_GENERATOR_ALLOWED = 0 # generators (obsolete, was 0x1000) CO_FUTURE_DIVISION = 0x20000 # division CO_FUTURE_ABSOLUTE_IMPORT = 0x40000 # perform absolute imports by default CO_FUTURE_WITH_STATEMENT = 0x80000 # with statement CO_FUTURE_PRINT_FUNCTION = 0x100000 # print function CO_FUTURE_UNICODE_LITERALS = 0x200000 # unicode string literals CO_FUTURE_BARRY_AS_BDFL = 0x400000 CO_FUTURE_GENERATOR_STOP = 0x800000 # StopIteration becomes RuntimeError in generators CO_FUTURE_ANNOTATIONS = 0x1000000 # annotations become strings at runtime class _Feature: def __init__(self, optionalRelease, mandatoryRelease, compiler_flag): self.optional = optionalRelease self.mandatory = mandatoryRelease self.compiler_flag = compiler_flag def getOptionalRelease(self): """Return first release in which this feature was recognized. This is a 5-tuple, of the same form as sys.version_info. """ return self.optional def getMandatoryRelease(self): """Return release in which this feature will become mandatory. This is a 5-tuple, of the same form as sys.version_info, or, if the feature was dropped, is None. """ return self.mandatory def __repr__(self): return "_Feature" + repr((self.optional, self.mandatory, self.compiler_flag)) nested_scopes = _Feature((2, 1, 0, "beta", 1), (2, 2, 0, "alpha", 0), CO_NESTED) generators = _Feature((2, 2, 0, "alpha", 1), (2, 3, 0, "final", 0), CO_GENERATOR_ALLOWED) division = _Feature((2, 2, 0, "alpha", 2), (3, 0, 0, "alpha", 0), CO_FUTURE_DIVISION) absolute_import = _Feature((2, 5, 0, "alpha", 1), (3, 0, 0, "alpha", 0), CO_FUTURE_ABSOLUTE_IMPORT) with_statement = _Feature((2, 5, 0, "alpha", 1), (2, 6, 0, "alpha", 0), CO_FUTURE_WITH_STATEMENT) print_function = _Feature((2, 6, 0, "alpha", 2), (3, 0, 0, "alpha", 0), CO_FUTURE_PRINT_FUNCTION) unicode_literals = _Feature((2, 6, 0, "alpha", 2), (3, 0, 0, "alpha", 0), CO_FUTURE_UNICODE_LITERALS) barry_as_FLUFL = _Feature((3, 1, 0, "alpha", 2), (4, 0, 0, "alpha", 0), CO_FUTURE_BARRY_AS_BDFL) generator_stop = _Feature((3, 5, 0, "beta", 1), (3, 7, 0, "alpha", 0), CO_FUTURE_GENERATOR_STOP) annotations = _Feature((3, 7, 0, "beta", 1), (3, 10, 0, "alpha", 0), CO_FUTURE_ANNOTATIONS)
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